标准编号：ISO/TR 22930-2:2020
中文名称：连续空气监测仪性能的评定 第2部分：基于无积累流动取样技术的空气监测仪
英文名称：Evaluating the performance of continuous air monitors — Part 2: Air monitors based on flow-through sampling techniques without accumulation
发布日期：2020-05
标准范围
The use of a continuous air monitor (CAM) is mainly motivated by the need to be alerted quickly
and in the most accurate way possible with an acceptable false alarm rate when significant activity
concentration value is exceeded, in order to take appropriate measures to reduce exposure of those
involved.
The performance of this CAM does not only depend on the metrological aspect characterized by the
decision threshold, the limit of detection and the measurement uncertainties but also on its dynamic
capacity characterized by its response time as well as on the minimum detectable activity concentration corresponding to an acceptable false alarm rate.
The ideal performance is to have a minimum detectable activity concentration as low as possible
associated with a very short response time, but unfortunately these two criteria are in opposition. It is
therefore important that the CAM and the choice of the adjustment parameters and the alarm levels be in line with the radiation protection objectives.
This document describes
— the dynamic behaviour and the determination of the response time,
— the determination of the characteristic limits (decision threshold, detection limit, limits of the
coverage interval), and
— a possible way to determine the minimum detectable activity concentration and the alarms setup.
Finally the annexes of this document show actual examples of CAM data which illustrate how to quantify the CAM performance by determining the response time, the characteristics limits, the minimum detectable activity concentration and the alarms setup.
标准预览图
立即下载标准文件